Standardize on Devnet capitalization in Fullnode doc (MystenLabs#3089)

doc/src/build/fullnode.md

@@ -81,7 +81,7 @@ We recommend the following minimum hardware requirements for running a fullnode:
 
 Storage requirements will vary based on various factors (age of the chain,
 transaction rate, etc) although we don't anticipate running a fullnode on
-devnet will require more than 50 GBs today given it is reset upon each
+Devnet will require more than 50 GBs today given it is reset upon each
 release roughly every two weeks.
 
 ### Software requirements
@@ -156,7 +156,7 @@ to run a Sui fullnode using Docker.
    ```
 1. Download the latest
    [`genesis`](https://github.com/MystenLabs/sui-genesis/raw/main/devnet/genesis.blob)
-   state for devnet by clicking that link or by running the following in your
+   state for Devnet by clicking that link or by running the following in your
    terminal:
     ```shell
     $ curl -fLJO https://github.com/MystenLabs/sui-genesis/raw/main/devnet/genesis.blob
@@ -213,7 +213,7 @@ Note the default metrics port is 9184 yet configurable in your `fullnode.yaml` f
 
 Whenever a new release is deployed to `devnet`, the blockchain state is
 typically wiped clean. In order to have your fullnode continue to properly
-synchronize with the new state of devnet, you'll need to follow a few steps
+synchronize with the new state of Devnet, you'll need to follow a few steps
 based on how you originally set up your node. See below.
 
 ### Built from source
@@ -240,7 +240,7 @@ Source](#building-from-source), update your fullnode as follows:
     ```
 1. Download the latest
    [`genesis`](https://github.com/MystenLabs/sui-genesis/raw/main/devnet/genesis.blob)
-   state for devnet as described above.
+   state for Devnet as described above.
 1. Update your `fullnode.yaml` configuration file if needed.
 1. Restart your Sui fullnode:
     ```shell